Advanced search "Attachment File Type" - "is not" also identifies parent items

When searching for "Attachment File Type" - "is not", I would expect the result to contain only attachment files. But it also identifies the parent item:

https://s3.amazonaws.com/zotero.org/images/forums/u265723/xtxkdnoduz0nx6i1u3la.png

Zotero 7.0.3-beta.2+10d27b8f6 (64-bit)
Windows 10
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